28164277 has 2 divisors, whose sum is σ = 28164278. Its totient is φ = 28164276.

The previous prime is 28164263. The next prime is 28164293. The reversal of 28164277 is 77246182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16597476 + 11566801 = 4074^2 + 3401^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28164277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28164247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14082138 + 14082139.

It is an arithmetic number, because the mean of its divisors is an integer number (14082139).

Almost surely, 2^28164277 is an apocalyptic number.

It is an amenable number.

28164277 is a deficient number, since it is larger than the sum of its proper divisors (1).

28164277 is an equidigital number, since it uses as much as digits as its factorization.

28164277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 37.

The square root of 28164277 is about 5307.0026380246. The cubic root of 28164277 is about 304.2515987589.

It can be divided in two parts, 28164 and 277, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 28164277 in words is "twenty-eight million, one hundred sixty-four thousand, two hundred seventy-seven".